I've had my Optus SIM for awhile, but I don't remember any KYC requirements when I bought it. That probably rules out converting it to an eSIM.

I had a similar issue with Taiwan Mobile two years ago. At the time, I didn't have residency there, so I was just a visitor. The shop was reluctant to move my SIM card over to an eSIM because they needed two forms of ID, one of which was local. Whether that requirement didn't exist when I had gotten the SIM card a decade earlier or the shop at the time didn't follow the rules, I don't know.